TDA8376 Datasheet, PDF (28/44 Pages) NXP Semiconductors – I2C-bus controlled PAL/NTSC TV processors

Philips Semiconductors
I²C-bus controlled PAL/NTSC TV processors
Objective specification
TDA8376; TDA8376A
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
BEAM CURRENT LIMITING (PIN 22); note 23
V_CR
V_diffCR
contrast reduction starting voltage
voltage difference for full contrast
reduction
V_BR
V_diffBR
brightness reduction starting voltage
voltage difference for full brightness
reduction
V_bias
I_ch(int)
I_disch
internal bias voltage
internal charge current
discharge current due to ‘peak-white
limiting’
−
3.5
−
V
−
2.0
−
V
−
2.5
−
V
−
1.0
−
V
−
4.5
−
V
−
25
−
µA
−
200
−
µA
Notes
1. Signal with negative-going sync. Amplitude includes sync pulse amplitude.
2. This parameter is not tested during production but is guaranteed by the design and qualified by means of matrix
batches which are made in the pilot production period.
3. This parameter is measured at nominal settings of the various controls.
4. Indicated is a signal for a colour bar with 75% saturation (chrominance : burst ratio = 2.2 : 1).
5. The RGB1 inputs (pins 14 to 17) have priority over the RGB2 inputs (pins 23 to 25).
6. Nominal contrast is specified with the DAC in position 20H. Nominal saturation as maximum −10 dB. In the nominal
brightness setting the black level at the outputs is identical to the level of the black-current measuring pulses.
7. This parameter is not tested during production and is just given as application information for the designer of the
television receiver.
8. The −3 dB bandwidth of the circuit can be calculated by means of the following equation:
f_{–3 dB}
=
f_o
sc


1
–
2---1-Q---


9. Valid for a signal amplitude on the Y-input of 0.7 V black-to-white (100 IRE) with a rise time (10% to 90%) of 70 ns
and the video switch in the Y/C mode. During production the peaking function is not tested by measuring the
overshoots but by measuring the frequency response of the Y output.
10. For video signals with a black level which deviates from the back-porch blanking level the signal is ‘stretched’ to the
blanking level. The amount of correction depends on the IRE value of the signal (see Fig.10). The black level is
detected by the capacitor connected to pin 2. The black level stretcher can be made inoperative by connecting pin 2
to the positive supply line. The values given are valid only when the luminance input signal (pins 7, 9 and 13) has a
value of 1 V (p-p).
11. The slicing level is independent of sync pulse amplitude. The given percentage is the distance between the slicing
level and the black level (back porch).
1996 Jan 26
28